MAF vs. MAP

[Mark Boxsell]

>Guys, a MAP system is no harder to DESIGN than a MAF system
>
>The difference is that a MAF system is much more flexible in the
>real world ... with a MAP system, you have a calculated map of the
>engines VOLUMETRIC EFFICIENCY, which is changed by things such as
>exhausts, etc ... you measure MAP, calculate air density, and with
>the rpm and VE know how much fuel you need ...
>
>If you change the SHAPE of the VE "map" of the engine, not even the
>EGO corrections (BLM for you GM'ers) will compensate completely, since
>the BLM cells are much coarser than the actual VE map ... only a few
>places will be actually "on" the rest, a bit off ..
>
>A MAF system measures actual air into the engine, and needs only minor
>corrections in general ...
>
>Jim Conforti
>
>Converting Flappers to HFM's and Speed-Density for racing use only
>
>
>

Jim,
         You still need a table for air fuel ratio load compensation. It
would be easy
if you could always stick to 14.7 (or any single AFR). But if you are measuring
what's going in I agree you are in front.
                 regards,
                                  Mark Boxsell
                                  MRB Design.